The characteristics of the independent model of PLC and the structure of a general-purpose PLC type PLC outside

Independent model of PLC controller is also called a type or universal PLC outside. For nc machine tools, independent model of PLC is independent of the CNC device, has a complete hardware structure and software function, can independently control tasks. The numerical control system diagram of the independent model PLC ( As shown in figure 1) 。 Figure 1 independent model CNC system block diagram independent model PLC has the following characteristics of PLC, 1) Independent model PLC CPU and its control circuit, the system program memory, a user program memory, input/output interface circuit, and the programmer external devices such as communication interface and power supply basic function such as structure, As shown in figure 2) 。 Figure 2 independent model PLC controller function structure ( 2) Independent model commonly used PLC modular module structure or plate structure, each function circuit into independent modules, or printed circuit board, with the advantages of convenient installation, functional, easy to expand and change. ( 3) Performance/price as built-in type PLC controller.
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